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Date: Thu, 30 Mar 2017 11:58:43 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Dave Martin <Dave.Martin@....com>, "David S. Miller" <davem@...emloft.net>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: [PATCH 4.4 09/14] sparc/ptrace: Preserve previous registers for short regset write 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Martin <Dave.Martin@....com> commit d3805c546b275c8cc7d40f759d029ae92c7175f2 upstream. Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the registers, the thread's old registers are preserved. Signed-off-by: Dave Martin <Dave.Martin@....com> Acked-by: David S. Miller <davem@...emloft.net> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/sparc/kernel/ptrace_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/sparc/kernel/ptrace_64.c +++ b/arch/sparc/kernel/ptrace_64.c @@ -311,7 +311,7 @@ static int genregs64_set(struct task_str } if (!ret) { - unsigned long y; + unsigned long y = regs->y; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &y,
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